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Standoff Distance in Ultrasonic Pulsating Water Jet

机译：超声波脉动水射流的立场距离

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摘要

The water hammer effect is the basis of technologies which is artificially responsible for the decay of continuous jets. A recently developed technique enhances the pressure fluctuations using an acoustic chamber, leading to enhanced erosion effects for various water volume flow rates. The optimum standoff distance for an ultrasonic enhanced water jet is not appropriately estimated using an inclined trajectory. The objective of this study is to comprehend the true nature of the interaction of the standoff distance following the stair trajectory and traverse speed of the nozzle on the erosion depth. Additionally, it also critically compares the new method (staircase trajectory) that obeys the variation in frequency of the impingements for defined volume flow rates with the inclined trajectory. In this study, at constant pressure (p = 70 MPa), the role of impingement distribution with the variation of traverse speed (v = 5–35 mm/s) along the centerline of the footprint was investigated. The maximum erosion depth corresponding to each traverse speed is observed at approximately same standoff distance (65 ± 5 mm) and decreases with the increment in traverse speed (h = 1042 and 47 µm at v = 5 and 35 mm/s, respectively). The results are attributed to the variation in the number of impingements per unit length. The surface and morphology analysis of the cross-section using SEM manifested the presence of erosion characteristics (micro-cracks, cavities, voids, and upheaved surface). By varying the water cluster, different impingement densities can be achieved that are suitable for technological operations such as surface peening, material disintegration, or surface roughening.
机译：水锤效应是人工负责连续喷射衰减的技术的基础。最近开发的技术增强了使用声学室的压力波动，从而提高了各种水量流量的侵蚀效应。超声波增强水射流的最佳支座距离不适当地使用倾斜的轨迹估计。本研究的目的是理解楼梯轨迹跟踪距离和喷嘴横向速度对侵蚀深度的横向速度的真实性质。另外，它还批判性地比较了遵守与倾斜轨迹的定义体积流量的切片频率变化的新方法（楼梯轨迹）。在该研究中，在恒定压力（P = 70MPa）处，研究了沿着占地面积的中心线的横向速度（v = 5-35mm / s）的冲击分布的作用。对应于每个横向速度的最大侵蚀深度在大致相同的支座距离（65±5mm）处观察到并且随着横向速度的增量（分别在v = 5和35mm / s处的横向速度（H = 1042和47μm）减小。结果归因于每单位长度的切片数量的变化。使用SEM的横截面的表面和形态分析表现出侵蚀特性的存在（微裂缝，腔，空隙和上表面）。通过改变水簇，可以实现不同的冲击密度，其适用于技术操作，例如表面喷丸，材料崩解或表面粗糙化。

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